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Silica Nanoparticles Suppress Fungal Pathogenic Allies to Alleviate Astragalus Root Rot
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Abstract
Background:
Biological control mechanisms involve the inhibitory effect of antagonistic bacteria on pathogenic fungal growth. However, research on controlling crop diseases by inhibiting allies of pathogenic agents is relatively scarce.
Results:
In this study, the application of SiO
2
NPs resulted in an increase in the alpha diversity of the microbial communities in the rhizosphere caused by
Astragalus
, as well as an increase in the complexity of the co-occurrence network. SiO
2
NPs reduced the abundance of
Pseudomonas
and
Microbacterium
in the rhizosphere of
Astragalus
. Co-inoculated
Fusarium
with
P. aeruginosa
and
M. oxydans
could exacerbate the root rot of disease in
Astragalus
. In addition,
M. oxydans
SCK-308 and
P. aeruginosa
XS-134-7 promoted the growth of
F. oxysporum
and inhibited the growth of certain beneficial rhizosphere microorganisms, thereby facilitating the occurrence of the disease. Metabolomic analyses revealed that salicylic acid, indole-3-acetic acid, brassinosteroid, and palmitic acid were significantly enriched in the rhizosphere of
Astragalus
treated with SiO
2
NPs. Exogenous supplementation with these metabolites significantly inhibited the growth of
P. aeruginosa
and
M. oxydans
, thereby alleviating root rot in plants during coinfection with two bacteria and
F. oxysporum
. These results indicate that the metabolites enhance disease control efficacy through targeted inhibition of pathogen helpers. Additionally, SiO
2
NPs enhanced the enzymatic activities of ascorbate peroxidase, catalase, and peroxidase in
Astragalus
plants.
Conclusions:
Our findings suggest that SiO
2
NPs alter the composition of the rhizosphere microbial community and reduce the population of allies of
F. oxysporum
, activating salicylic acid-dependent systemic acquired resistance (SAR) in
Astragalus
and thereby decreasing the incidence of
Fusarium
root rot. These results suggest that SiO
2
NPs can serve as a sustainable agricultural practice.
Springer Science and Business Media LLC
Title: Silica Nanoparticles Suppress Fungal Pathogenic Allies to Alleviate Astragalus Root Rot
Description:
Abstract
Background:
Biological control mechanisms involve the inhibitory effect of antagonistic bacteria on pathogenic fungal growth.
However, research on controlling crop diseases by inhibiting allies of pathogenic agents is relatively scarce.
Results:
In this study, the application of SiO
2
NPs resulted in an increase in the alpha diversity of the microbial communities in the rhizosphere caused by
Astragalus
, as well as an increase in the complexity of the co-occurrence network.
SiO
2
NPs reduced the abundance of
Pseudomonas
and
Microbacterium
in the rhizosphere of
Astragalus
.
Co-inoculated
Fusarium
with
P.
aeruginosa
and
M.
oxydans
could exacerbate the root rot of disease in
Astragalus
.
In addition,
M.
oxydans
SCK-308 and
P.
aeruginosa
XS-134-7 promoted the growth of
F.
oxysporum
and inhibited the growth of certain beneficial rhizosphere microorganisms, thereby facilitating the occurrence of the disease.
Metabolomic analyses revealed that salicylic acid, indole-3-acetic acid, brassinosteroid, and palmitic acid were significantly enriched in the rhizosphere of
Astragalus
treated with SiO
2
NPs.
Exogenous supplementation with these metabolites significantly inhibited the growth of
P.
aeruginosa
and
M.
oxydans
, thereby alleviating root rot in plants during coinfection with two bacteria and
F.
oxysporum
.
These results indicate that the metabolites enhance disease control efficacy through targeted inhibition of pathogen helpers.
Additionally, SiO
2
NPs enhanced the enzymatic activities of ascorbate peroxidase, catalase, and peroxidase in
Astragalus
plants.
Conclusions:
Our findings suggest that SiO
2
NPs alter the composition of the rhizosphere microbial community and reduce the population of allies of
F.
oxysporum
, activating salicylic acid-dependent systemic acquired resistance (SAR) in
Astragalus
and thereby decreasing the incidence of
Fusarium
root rot.
These results suggest that SiO
2
NPs can serve as a sustainable agricultural practice.
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